Automatically-adjusting gear puller



, 1,644,839 Oct. 11, 1927. v M. L; LANDRUM AUTOMATICALLY ADJUSTIjNG GEARFULLER Filed Aug. 24, 41926 4 Fig. 1

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Vl/.Lan drum ABY Patented Oct. 1l, 1927.

UNITED STATES MARK L. LANnRUivi, or PLYMOUTH, cALrFoRNrAAToMATICALLY-Ar-Jusrrnd GEAR PUL'LER.

Application filed August 24, 1926.

without necessitating moving the center pull-V !H ing screw.

A further object is to arrangeA the parts' of the tool so that when apulling pressure is exerted it will be impossible for the arms to slipfrom the gear, and the greater the l pressure, the greater will be thetendency for the arms to grip the gear.

A further object of the invention is to produce a simple and inexpensivedevice and yet one which will be exceedingly eti'ective 3" tor thepurpose for which it is designed.

These objects l accomplish by means of such structure and relativearrangement of parts as will fully appear by a perusal of the followingspeciication and claim.

in the drawings similar characters ot ret'- erence indicatecorresponding parts in the several views:

Fig. 1 is a sectional elevation of my improved gear puller.

Fig. 2 is a top plan view ot the tool.

Referring now more particularly to the characters of reference on thedrawings, the numeral 1 denotes a cupped disc having a central hub 2projecting from the concave Yface of the disc. A pulling screw 3 isthreaded through the hub, said screw having a square or similar shapedhead 4 to enable a wrench to be applied.

Slidable on the hub 2 is a sleeve 5 formed with a hand grip portion 6 onits outer end, the screw projecting through yand beyond said sleeve acertain distance.

Projecting vradially trom-the sleeve are a plurality oi spaced pairs ofears 7 which 'form bearings for th-e pins 8 of a corresponding number otarms 9. The arms project beyond the disc 1 a certain distance and atktheir outer ends (which are opposite to the headed end of the screw) areprovided with inwardly projecting pads. 10 to pass under and engage theside of a gear to be pulled. j

The arms are formed with heavy lugs 11 which overhang and engage theconcave face of the disc, and they also have guide fingers 12 engagingthe opposite and convex face of sern No. 131,193;

the disc, slots 18 being thus formed between the members 11 and 12.

The curvature and depth ot these slots relative to the disc is such thatthe arms turning on the pins S may inovc inwardly towardeach otheruntil, the padsl 10 are fairly close together so as to engage a smallgear-5 or they may swing outwardly until the ends of the members 11 and12are nearv the rim of the disc, as indicated in dotted lines in Fig. 1.

Vith this position of the arms of course a large gear may be engagedthereby. Further separating movement of the arms is prevented. by the-ends thereof above the pins 8 coming in contact with abutments 14Cformed on the sleeve 5 between the bearing ears 7 This movement takesplace automatically when the sleeve 5 and disc 1 are moved to and fromeach other, since the center of curvature ot the disc and slot 13 is onthe central longitudinal axis of vthe sleeve and hub. As the disc andpivot points of the arms are moved to vand from each other, the armstherefore must swing one way or the other so as to maintain the Centerof curvature of the slots 13 at the same point as the center ofcurvature of the disc 1.

The sleeve and disc are held from turning relative to each other by anysuitable means, such as for instance a pair of lugs 15 on the discbetween which the linger 12 of one of the arms 9 passes.

In operation the handle member 6 is grasped by one hand and the head ofthe screw 3 in the other. The arms are then separated by a relativemovement between the parts to which these elements are connected, so asto enable the pads 10 to pass by the periphery of the gear 16 to bepulled. The movement of the hand engaged parts is then reversed untilthe pads 10 pass under and engage the face of the gear furthest from thetool. The screw is then advanced by hand until it engages the end of thegear shat 17, when a wrench is applied to rthe head 4; to further turnthe screw and exert the necessary pulling pressure.

y Such pressure of course causes the gear to be pulled from the shaftand also causes the arms by reason of the disc and the lugs 11 engagingthe same, to tend to move even closer together, so that slipping of thearms from the gear is impossible.

It will be seen that all load is taken by the disc and by the heavy armlugs 11, which together with the arms are designed to have sufficientstrength to take any strains which may be imposed thereon.

The fingers l2 do not come into play with the pulling operation and aresimply provided to insure simultaneous separation of the arms when thetool is being withdrawn from the gear.

From the foregoing description it will be readily seen that I haveproduced such a device as substantially fulfills the objects of theinvention as set forth herein.

While this specification sets forth in detail the present and preferredconstruction of the device, still in practice such'devian tions fromsuch detail may be resorted to as do not form a departure from thespirit of the invention, as defined by the appended claim.

Having thus described my invention what I claim as new and useful anddesire to secure by Letters Patent is:

A gear puller comprising a screw for engagement with the end of a shaft,arms for engagement with a gear on the shaft, a cupped disc, a hubthereon through which the screw is threaded, a sleeve member slidable onthe hub, pivotal connectionsbetween the arms and sleeve member, andprojections on the inner faces of the arms straddling the opposed facesof the disc and orming slots concentrically alined with the iso.

In testimony whereof I affix my signature.

MARK L. LANDRUM.

